Great article, liking the analysis. Reminds me of the "steak look" I got from a girl once while walking on campus.
She stared at me with dilated pupils, mouth slightly ajar, and full eye contact. I likened it to the way you would look at a nice, juicy steak. Or maybe she just wanted to eat my face, hahah.
At the time, I could tell she was into me. I also ecall how her reaction was involuntary, i.e. not her conciously trying to entice me with a look.